134 



Extensions of photosynthetic experimentation 



synthesis often amounted to 30% of the value at light Saturation. Under such con- 

 ditions the observed quantum yields were consistent with the minimum require- 

 ment of 3 to 5 quanta at lower light intensities, and were a function of light in- 

 crement intermittency 1 and intensity. 



References 



1 See Burk, D., and Warburg, O., Naturwissenschaften 

 37 (1950), 560, and Z. Naturforsch, (in the Press, 1951). 

 Myers, J., Chap. 17 of Photosynthesis in Plants, by 

 J. Franck and W. F. Loomis. Iowa: The Iowa State 

 College Press (1949). 



Warburg, O., and Burk, D., Arch. Biochem. 25 (1950), 



410. 



Warburg, O., and Schocken, V., Arch. Biochem. 21 



(1949), 363. 



